If it really bothers you, buy direct from Hong Kong on ebay and buy one without a built in flash. Should be much cheaper. Not sure what they use in those horrible onboard flashes in the holgas but they must be gold plated at the price I've seen.
I did that - no flash, and I bought one with a glass instead of plastic lens. Once you get the back taped on properly so it won't leak light it provides disappointingly sharp images. Not quite as sharp as a 1950s Kodak Brownie, but not at all distorted enough to be true "Holga" images.