Stuck in 2nd gear

My 90 MX-6 Manuel Transmission has gone out. It is stuck in 2nd gear, I can put it in neutral and it goes like it is 2nd gear. I can put it in the other gears but it will not go it acts like it is trying to go but wont move. It shakes then dies when in other gears even 2nd position. I can only go 20 mph and it blows any suggestions or good spots to get a cheap tranny??? any thing will help Thanks a lot.