For basic B&W printing, I highly recommend an HP. Buying new, we've used this one with good success:

http://www.newegg.com/Product/Produc...82E16828115080

($99.99 with free shipping)

Buying used, I look on eBay for an HP 5 laserjet, which are great, durable workhorses. I bought one used a few years ago and it continues to go strong (not unlike this one

http://cgi.ebay.com/ws/eBayISAPI.dll...m=390014313806

Because these are heavy printers, though, watch out for the shipping cost.

Good luck!