Wondering what's available for online coupons in OKC, for restaurants and groceries.

While it's not specific for OKC you can go to coupons.com and smartsource.com for grocery coupons. Livingsocial.com is another place for restaurants, etc.
Homeland has a section on their website for both general grocery coupons and for coupons which apply only at Homeland stores.

Livingsocial as mentioned.

Some others are:

deals.eataroundokc.com

restaurant.com (certificates do not expire. if a places closes and you have an unused certificate, it can be swapped for a generic certificate to use later)

wimgo.com

entertainment.com (books run about 35-50% off this time of year, with most coupons good through Nov 1. OKC and Tulsa editions available in-state)

mypoints.com (reviewing emails and shopping online via their portal assigns points to a participant. Points can be traded in on rewards cards. Each year I collect a few 10.00 to 25.00 off cards, mostly to chains like Panera, Applebees, Olive Garden, Chili's, Red Robin, B-King, or Old Navy, JCP, etc. I distribute these to my kiddos and my lovely to use or gift as they elect.

I've not done much with online grocery coupons. We have numerous coupons show up in the mail and paper though.

There are several smart phone apps that also offer coupons. Also some retailer's apps also offer coupons not otherwise advertised.

I use Coupon Sherpa app a lot.

In addition to the above, checking in on Gowalla or Foursquare often lead to coupns and freebies.