I've never seen a set with the wrench sizes you are looking for, so singles may be your only choice. In the 2 or 3 times I've priced singles vs sets there really wasn't much price difference. I was shopping USA produced industrial brands.
You may want to give a look at the Williams tool line at Tools Delivered:
http://www.toolsdelivered.com/SAE-Combination-Wrench_c_2714-1-1.html
They offer both USA and Taiwan made wrenches. To take a 2" satin chrome combination wrench as an example:
Williams 11164 | Satin Combination Wrench 12-Pt, 2in. $ 57.00 Taiwan
Williams 1190 | Satin Combination Wrench 12-Pt, 2in. (USA Made) $ 94.47 USA
The 2" choices at HJE are well over $100 for Wright and SK, which is probably the going rate for domestic products of this size.
Zoro has Proto in 2":
Satin Chrome $ 102.99
Black Oxide is 4 cents cheaper at $ 102.95
As stated above, service wrenches are about 1/4 the price but are open end only and short.