KEH.com is a great source. check out dyxum.com and your local craigslist for great used deals. Also they are all over ebay, dpreviews seller forum, and fredmiranda.com just make sure you get the older minolta lenses (built like a tank ones). If you need any review of a lens before you purchase just google " Minolta (insert lens here, for example -- 50mm 1.7 --) Dyxum " and you will have lots of user reviews + sample images at your fingertips. Good luck!