I have not seen one cheaper for the Turbo 35. I would be leary about using anything not especially made for the Turbo 35. If you want to save some money though check on ebay. You might get lucky there.
The ones made by CE is actually for the Turbomatcher4/35 and is very sturdy. Can't go wrong with one. They just sold it seperately so owner of the T35 or GFX user can match cells one at a time.
We normally keep 10 to 12 spare ones just in case we need to replace them on the matchers. But they are of the highest quality so I suggest don't get anything else. Unless if you're planning to get 12 of these which will cost you 12x$30=360, you might as well find some uesd older turbomatcher on ebay which has six per matcher and they normally sell for around $150. That ways,you can spend $300 and have 12. Just a thought.