What double Camping stove under 80euro for 907 bottle ?

I've used similar campingaz ones to this one https://www.amazon.co.uk/Campingaz-Base-Double-Burner-Stove/dp/B00691GJ4A/ they change a bit over the years but essentially all the same. The regulator and hose you have already will complete the set up.

Only downside to these cheap stoves is that you need to keep them clean store them dry and not knock them about. Once the paint comes off they rust and its easy when camping to make a bit of a mess of them.

Edit> Virtually the same stove with a lid https://www.amazon.co.uk/Campingaz-Base-Double-Burner-Stove/dp/B00691GJ3G/

Both of those are cheap and chearful btw. Plenty to fault with them if you really go looking hard but the price makes them a viable option the rings don't have a massive output (1.6KW) and some people might like something more powerful. Never used one but this looks interesting https://www.amazon.co.uk/NJ-NGB-60-Burner-Stainless-Outdoor/dp/B01LZI018Z/ with a massive 3.6KW output per ring so at full blast with both rings a full 907 will last less than 5 hours (the campingaz would last just short of 10 hours with both rings on full).