What do you mean by a good one at "reasonable" cost ? - you get what you pay for, personally if you want cheap then just go and buy a wet/dry vac of better quality than that offered by "gutter clearing" companies and source the carbon poles ( defo bypass Ali ones ) as they seem to just throw a vac and pole set together, better makes have at least modified the inlet port.
What are you clearing, if it's houses and you don't mind going up to clear heavy blockages and downpipes by hand then any old vac should do, but for heavy deposits, 3 storey, commercial you need better equipment we've had an omnivac over six years and it has only now blown a third motor ( we clear on average 4 properties a week ) so quality of the vac is also important.
Gutter cams - those sold by "gutter vac manufacturers" are usually very overpriced, have a GoPro for vanity - sjcam are ideal at around £50 but even cheaper are little bird box cameras and receivers ( from around £25 ) when I started GoPro etc, didn't exist so I used the bird box camara setup works a treat, but when you've done a few gutters you get a feel for how empty they are, I use the camera maybe 1 in 50 jobs - I'd rather have a really good range of nozzles that fit into some of these weird places and angles.
Pricing is upto you we charge 2x our Reg. Cleaning rate a four bed detached usually takes around 35 mins from arrival to leaving but we work as a 2 man team.
Single runs take around 10 mins as a pair but upto 25 mins as a single operator generally speaking, lots of variables, access, type of gutter, Sky to cables, etc...
Darran