Sources for transaxles for your car
'99
new- not avail any longer

rebuilt, I'd stick with an HEC trans (the ones who supply Honda with their rebuilt units)
You'd need your vin and the trans model code that's on the sticker on the top of the unit.
Expect to pay between 2500 and 2900 just for the trans depending on the length warranty you want. Installation is about 6 hours labor.

Jasper also builds these units, but I've been having no luck with their other products lately, and they are WAY pricey.

You could go used, but you must get the exact model that your car has. (example, a '98 V6 has a B7XA) If you don't you could get one with mismatched electrical connectors or worse, the wrong size axle shaft holes in the diff.

since your car is at 71k and just under 7 years, call a Honda dealer asap, you may be covered under a warranty extension for up to 7 years, it's either 70k or 100k. I've had a few '98s with lower or slightly more mileage being given special consideration and they will usually just charge labor and a reman trans is included.