Fidgetyrat
macrumors 6502
When you want to upgrade from 256 to 500 GB they ask for $400!!! I mean on Amazon you can get a FULL 500GB SSD for $180 and thats retail price!
OWC has some fantastic SSD drives, often times 100% compatible with all features of OS X and even faster. I've replaced all my apple disks with theirs over the years and WAY less expensive.
I pretty much order Apple parts with this in mind upgrading important non-replacable things like CPU and RAM and taking the lower end SSDs. After upgrade, the Apple SSD can go into an enclosure and be a fancy USB disk.