CPU prices change frequently and the prices we obtain and post each week are a snapshot of the CPU price market for a given moment in time. Prices can go up and down daily, depending on market conditions and availability. OEM CPUs usually do not come equipped with a heat sink or fan. They also usually come with a weak warranty, often in the range of 15-30 days. That is usually enough time for you to burn-in your CPU and make sure it's ok.
Retail prices are higher since they generally include the longer warranties, fans, heatsinks, etc.
If we quote retail prices for certain CPU models, it will be noted as such. Prices listed do not include any additional charges for shipping, sales tax, etc. Be sure and ask your vendor about those charges before ordering. Some online vendors will have different prices for phone vs. online orders. Incidentally, the list of vendors we come up with each week is generated by hand from our own research and Sharky Extreme does not receive any sort of advertising fee, sponsorship or other type of promotional incentive from any of these companies that appear on the list.