Nobody is going to test on a 1900/2800. They are just too old, and have fallen way off the radar for anybody.
A WS-C2950-xx is extremly close to the 2960 in features and configuration. Its only been EOL'd fairly recent (announcement for the general line on Oct 22, 2007), so it hasn't gone down in cost too much on eBay, but what are you talking about fairly cheap? A WS-C2950-24 is going for $230 buy-it-now on eBay. Several auctions start in the $30 range, but I suspect the 24 ports get up closer to higher $1xx range. I saw some of the 12-porters going for $105/$107 auction wins.
For a CCNA lab, I'd pick up a WS-C2950-12, which will be close enough to the 2960 in the book for all purposes. You can figure out the rest from here I'm sure.
The generation after the 1900/2800 is the 29xx goes for cheaper, but the differences will be greater (not quite as great as the 1900/2800 though). They go for $50 (WS-C2924XL-EN-24). For the extra $50, I'd get the 2950 for your lab work. It'll be alot closer to what you'll be tested on.