I am planning an auto to manual conversion on a 94 accord next moth. All the parts at a local pull-a-part cost me about $170 a few months ago.
You can see prices
here but you will need to choose a location before the prices will show up.
At minimum, you will need the trans, flywheel, pressure plate, clutch disk, floor console, shifter and linkage, clutch pedal and cable or hydraulic lines (slave cylinder will be attached to the trans if it is applicable).
You may need the manual transmission version of the starter and axles- to determine that, simple go to an online parts store, like autozone.com, and select the volvo with auto and manual trans and see if the axles and starter are the same or different part numbers. For aesthetics, you may also want the manual trans version of the dash (no PRND indicator lights) and you may need the manual trans ECM- or trick the computer into thinking the trans is in neutral all the time so the starter will work.
The brake pedal on autos is usually wider than a manual trans car, but rather than getting the manual style, one could simply cut part of the pedal edge off.
It will likely be a 20-30 hour job when you consider how much time it will take to pull the trans and parts yourself in the hot pull a part yard. But hey you get the practice for when you do it on your own vehicle....
I bet the parts cost would be $500+ if the junkyard hands you the parts over the counter.
__________________