Hi
The advesive won't cost you much dependant on how much you use ,
I reckon the services of a proffesional Flooring contractor for this type of repair workwould demand a fee of say £25 - £40/hour ,
Spray adhesive approx £2/tin , if you go down the ball's road then you would have to buy a complete jar , normally 5lts or 15ltr and to be honest you would use hardly any of it , unless you know of a fitter who would sell you a quater of a bucket for a bit of cash.