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I'm not 🙁. Would've love to shop around
If you are keen to get a strobe kit, go find the pro photo shops in your community. They will likely have a bulletin board where photographers looking to sell their kits are posting. Also talk to the person who handles pro sales, they may a line on used kit coming up for sale.
There are three main parts to a strobe. The power storage (iirc capacitors), the power management (the dials and switches) and the bulbs.
If properly used, the capacitors will last a long long time. So avoid something that looks like it comes from the 1970s. But even 20 years is not too old, if kit doesn't look too worn from use. A banged up kit should be avoided. A dusty but not banged up one should be OK.
The switches and what not so have a tendency to wear out, sometimes. Cheaper kits will adjust their power in whole fractions. For example 1/4, 1/2, 3/4 power. The more fractions the better (1/8, 1/4, etc). The better kits have sliders that allow you set the power any where in the range. Often (at least in my experience) the slave eyes may lose sensitivity, but that is easily worked around if you get a used kit for a good price.
Bulbs wear out from use, and can be expensive (and difficult) to replace. Do some research on replacement bulbs for any kit you buy - used or new. In some cases the bulbs can be more expensive than the kit itself, if you are buying used. Obviously, getting replacement bulbs as part of the deal would be a big benefit.
Often, there are two bulbs in a strobe head. The modelling light is designed to be turned on and to stay on while you are composing the shot and focussing. In some cases, these bulbs are very expensive because they are speciality Halogen bulbs there were used to mimic the shape of the light put out by the strobe. In other cases you can use ordinary household bulbs. However, ordinary bulbs may be too dim to effectively work.
The other bulb is the strobe, and it nearly always proprietary to that manufacturer. Hence, often monopolistically priced. You will need a new one the day of the most important shoot you have booked.
Strobe kits come in two basic flavours. Each has its benefits and disadvantages.
1) The power storage is centralized in a single power pack, and the controls are on the power pack. There is a single power cord from the power pack to a wall plug, and then there are cables that lead from the power pack to the individual light heads. Often this is better for travelling or for shooting in the field. It will pack smaller, and be lighter overall. And single long extension cord or generator is needed to power it in the field. However, all the light heads need to be connected to the central power pack, so there are limits on the distances. Also limits on how many heads you can power from the power pack, though the really good units allow you to add power storage modules to the main power pack. You can control the lighting levels for each light on the power pack, which saves you the walk back and forth to the lighting heads.
2) Each light is self-contained. It has power storage integrated into it, and all the controls. Each light plugs into a wall plug for power. It's cheaper to buy one or two lights this way, than a power pack system - but once you are up to 4 or more lights the power pack system - for lighting systems of equal quality - tend to be cheaper since there isn't so much redundancy. Once you are into a full kit (4 or more lights) there is more to pack overall in this system if you need it to be portable, though - while there may be more of it, each piece individually is lighter than the power pack (above). In a large studio, you can control the cables easier with this system since there is only a power cord that lead to the wall, and not cables all snaking back to the central power pack. Generally this system has slave eyes built to synchronize the flashes. Unless you get the remote control upgrade, you need to walk to each light to adjust light output.
Of course, you can combine the two systems... the slave eyed lights can be triggered by the power pack lights.
Hope this helps.... Good Luck.