Probably a tie between my 1923 mosin ex-dragoon and my marlin 795.
The 795 was on the rack for $139 but on sale for $129. It also came with a $25 mail in rebate that took a mere 7 months to get back
So, $129 x.07 sales tax + $16 NICS check = $154 approx. Now if you wanna factor in the rebate that's your call.
Mosin was $150 (remember, not your average wartime 91/30..so it's got a little more value) FTF transaction so no tax or background check fee. It also came with 200+ rounds of surpus x54r. (200 is a conservative number, it was enough to completely fill a .30 cal ammo can.)
As far as bang for the buck I did well with both in my opinion. They have both been EXCELLENT firearms and have seen much use since.