Zeb! Be careful when looking at the clones, there are good quality clones and then a clone of a clone (thats where the quality will suffer).
There are many many un-branned makes and models of these tablets all made cheaply, some models now support flash and many do not. You will find many ebay sellers adverting these tablets as the new 2.2 OS system but sadly you will end up just with a 1.6 OS tablet thats been hacked to run 2.2 (the device then suffers many software problems in this case).
I currently run 1.6 OS which is 2.1.2-205 version, I've upgraded this version already and it works a treat. The 7" tablet thats 1.6 costs only Ã‚Â£40 to Ã‚Â£80 depending on where you buy, if you find a good honest supplier you can buy several and go for the upgrade and test different versions, its all good fun along with the headaches when the thing dies due to software failure (I've managed to bring 2 back to life with the correct software upgrade.......
Good luck in you shopping experience.