I visited a Sports Direct outlet recently and out of curiosity bought a pack of three Slazenger Hydra X Overgrips (cost 1.49pounds/US$2.17) to try as I was not aware that Slazenger produces overgrips.

Was pleasantly surprised that the grips are very tacky and absorbent and would rate them as good, if not better than Yonex Supergrap and Wilson Pro Overgrip imho. Its definitely value for money given than 1 grip cost less than 50pence (US$0.73).