Alex,
The ISOC site has been bashing most of the Boca Chica hotels. I am looking at Hotel Garant for my next Boca Chica trip (possibly next spring). 809-523-5544. The address is 9 Calle Sanchez (North-South street). It is between Avenue 20 Decembre and Avenue San Rafael. economy room $40 USD per night.
http://www.hotelgarant.com/airport/
http://www.hotelgarant.com/pricing.html
Chica friendly. Owner Mathieu Garant. 1-1/2 blocks north of the strip. 2 blocks north of the beach.
Good reviewed on trip advisor.
Never been there but at least it's an option.
Sincerely,
Jim