Is not that new processors require W10, it's just simple capitalistic Microsoft want everybody move to W10, and they entice vendors to do so. If you don't mind last year merchandise, and can get it cheaper too, vendors with 2015 inventories may still bundle their machines with W7.
If you must have the latest hardware (good luck with the budget you posted), you just have to pay separate for a Win7 license.
(There is a solution to everything, it just takes more money!)