Almost anywhere.

Fiverr. Guru. Any microwork site.

And... If your site is a money site (paying your bills), stick with WordPress.

Custom code is far more expensive to design + maintain + always far more hackable.

Also WordPress sites run much faster than custom code sites, because with WordPress caching is already thought out + implemented well.

With WordPress, sites can easily be built to maintain a 1,000,000+ requests/second on cheap hardware.

Attaining this performance level is possible + generally costs a large amount of budget to implement + keep working.

You'll use WordPress if cost + performance are a consideration.

You'll use custom code if you're independently wealthy, with unlimited time/budget... also patience... as custom code will leave you balled up in a fetal position, sobbing yourself to sleep many nights.