I agree with Rabbitangler, good advice, it is possible to save a lot of money on tools, for example, the needle in a cork, or you could learn to whip finish with your fingers rather than buy a finishing tool, which can be expensive. Once again, scissors and a bobbin holder could really be the only tools you spend more than maybe £10 each on, (hackle pliers may also be a wise investment, but they're not that expensive) but there are lots of cheaper alternatives that are of a similar or the same quality.
One thing I will say with scissors though, serrated is probably best, you may find that with certain materials, not serrated scissors may just push the material out from between the blades, whereas serrated grips the material.
Have a look at Lakeland Fly Tying, they have a huge range of different tools, you could browse by brand to get an idea of prices between them
Personally I like Dr. Slick, great quality, and not too expensive, they have a fly tyer's gift set which includes the main tools, like ceramic bobbin holder, threader, dubbing needle, hair stacker, finisher, hackle pliers, it is £35 which is quite expensive, but as I said they are good quality (they also have a bamboo handled version for £10 extra

) I think the Dr. Slick scissors are one of their best tools, serrated, and again, not over-priced (some may disagree) Some tools are over-priced though, I have yet to find out why Petitjean tools are so expensive. A bobbin holder that I am considering buying is the rite bobbin, it is great for a new fly tyer like me, as i am not used to different types of thread yet, so the adjustable tension is a great thing to have, but still, some versions are over £20
Hope this helps