I'm currently studying at SKOLA in Soho, costing £995. Started in January and finishing in April. It's Part time, Tuesday and Thursday evenings 6:30 to 9:30 and 7 Saturdays, 10am to 17:00pm.
Out of 10, I would give them an 8. The main tutors I've had teaching us have been very supportive and very informative on how to teach lessons. Location is extremely convinient for me to travel to and the timing of the lessons fits well with my heavy work commitments.
I don't think you will find many hand's-on part time CELTA course for less than £900, and I'm not saying SKOLA is better than IH, it's just a school that I've really enjoyed studying at and meeting 11 new friends.
If you have other places in mind (always check courses via the Cambridge website for authenticity!), I'd advise checking the schools out and applying asap. Places get snapped up VERY quickly!