If you want more than 1 Guncon, I think it was posted CC has it with 2 Guncons for $54.99 (might have been Crisis Zone but I think it was Time Crisis 3), which is like getting an extra Guncon for free
It used to show up pretty cheaply used on EBgames.com. Maybe you could check a local store, I think the price used to be either $17.99 or $24.99. I know I got Crisis Zone with a Guncon a month or two ago for like $15 after coupons.