[quote name='Kakita Kaiyo']a) What is a good price for a 360 controller these days (new and/or used)[/QUOTE]
For an official wired 360 controller, you're looking at... say, $40 USD new.
That said, pick your poison.
Best Buy - $39.99 USD (free shipping)
Amazon - $34.31 USD (free shipping)
Bu--Rakuten Shopping - $32.24 (free shipping)
Rakuten Shopping (formerly Buy.com) is legit, by the way; I grabbed my
Soul Calibur V TE arcade stick from them about a month ago.
If you're looking for something cheaper and PC-only, the Logitech F310 gamepad will run you about $25 brand new.
Best Buy offers free shipping.
[quote name='Kakita Kaiyo']b) Does anyone know of any good deals?[/QUOTE]
'Fraid not, unless you wanna count the discounted items above as deals.
[quote name='Kakita Kaiyo']c) Any other advice regarding game controllers and PCs?[/QUOTE]
Please keep in mind that some PC games (usually most older titles) don't play nice with Xinput. If you decide to go with the F310, you can simply switch from Xinput to DirectInput via a switch on the back of the gamepad.