Besides eBay and Craigslist are there any good places for me to sell my Macbook? I can't use this site's marketplace as I don't have enough posts. Thanks.
Depends where you live.
Maybe an ad in a newspaper? Go with ebay an secure you with the text that you only sell to people which live in the same country and have no negative recommendation.
Depending on your region, you might try Kijiji. When I live, it seems to be more popular than Craigslist. I've both bought and sold there before, though not a computer.
Besides eBay and Craigslist are there any good places for me to sell my Macbook? I can't use this site's marketplace as I don't have enough posts. Thanks.
I don't think you need other options. I've sold Apple products on both and have always had more than enough of an interested audience. The market is what it is for the macbook and I think you'll get market value from those places.