Need google map expert for IOS app -- 2

Please read in details: I already have google map api setup on my IOS app, but the cost is very high! I need to setup "session" or maybe suggestions to use other map api, key function I need is "address autocomplete". So purpose is:

1. Modify google map codes (objective C) IOS app.
2. Suggestion another map which is comparable or better than google map's Auto Complete.

Thanks.