If you have a Micro Center within say ~100 miles round trip you should get your CPU and perhaps mobo from there…

Newegg 2500k ~ 230 ; 2600k ~ 330
Micro C 2500k ~ 180 ; 2600k ~ 280

Even their mobos tend to be a bit cheaper(I believe that, unlike their Intel CPUs which IIRC are sold at cost or as a loss leader, mobos can be ordered online):

Newegg GIGABYTE GA-Z68X-UD3H-B3 ~ 160 after MIR
Micro C GIGABYTE GA-Z68X-UD3H-B3 ~ 150 after MIR

Out of curiosity, what are you upgrading from(current PC)?