Tranny Going Out?

[1slowdsm]

My tranny is starting to grind in first gear when I'm a stoplight. It feels like its in gear and when I let off the clutch and add some gas and all it does is grind and pops back out of gear. So then I either have to hold up traffic and get honked at while I wait for the gear to stop spinning or I force it in and go. Its weird, because the clutch is pressed in all the way and it still grinds going in sometimes. Anyone have any ideas on whats wrong? Is my tranny going out? How much could I get a tranny for these days? I guess this winter I'll be doing nothing but maintenance and repairs on my car.

One more thing to add. When I'm at park, I can hear this weird scraping type sound coming from the bottom of the tranny. Thats only when I let my foot off the clutch. When the clutch is pressed in, the sound goes away.