It's sounds like what is needed is a good stretch, before you part with any money.
My experience is all sports specialists will advise a vigourous stretching program. Most people, including myself do not stretch enough and it is surprising how 20 minutes a day can pay big dividends. Concentrate on the hamstrings and the ITB and after 2-3 weeks of stretching and no running start again gently.
Also, check the running shoes are OK. If still getting trouble then you might have to stretch the wallet as well.