High quality AND cheap? Vintage from Ebay or car-boot sales. There's a huge selection; boxwood handled, London pattern handles, plastic handles, no handles, cast steel, modern steels, fine bevelled-edged, firmers, registered firmers - take your pick!
Of new chisels - depends what you want of them. If you're doing fine cabinetmaking with lots of dovetails, Ashley Iles are the best value fine-landed bevel-edged chisels on the market. If you only cut a dovetail once every Preston Guild, then almost anything will serve, provided it has a handle that suits you. It's hard to find chisels with really bad steel these days, unless you're particularly unlucky. The Marples splitproof handled ones get good reviews, and are available pretty well everywhere.