there is a mixed DVD/LD combo from Pioneer which is excellent, my mate has the previous incarnation, the DL-909 (current is Pioneer DVL-919) - maybe a higher price than you're looking to pay but an excellent box and one box does the two formats. It plays both sides of the LD but won't do that with a

flipper DVD (but movies which come like this are bin-material)
this may or may not help you but they are out there....
PS: there are two advertised in the classifieds in this months Home Cinema Choice magazine but since I don't know these people and I guess it is against posting rules, I will leave you to get down your local WH Smith and buy the magazine.