A few places to look
www.amtjets.com
www.motorsandrotors.com
www.alshobbies.com
www.jetlinemodels.co.uk
www.wren-turbines.com
www.avonds.com
Everything for the inexperienced and the topgun pilots but maybe you should go find
your local jet flying field and see what it involves before you jump in.

My first jet was an Avonds F15 the one in my avatar and by the time i got to the flying stage
it cost me roughly £3500 (probably cost more but i gave up counting)

Have fun
Brian