We've used www.selectblinds.com for all of ours (and our friends have too). We have the faux wood white ones and they look great. Our friends have real wood brown ones and those look fantastic as well. I've been really happy with them
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If you're willing to do the install yourselves, get the faux wood blinds from Home Depot/Lowes. They'll cut them down to the correct length in the store and they are substantially cheaper than buying 100% custom. We did our first house for less than $500 (we did have coupons, too) and only needed to buy 2 custom blinds (for the super narrow windows).
Re: recs for custom blinds company
Thanks for the tips!