Just walked past my local Domino's (Leicester) they currently have an offer on where any pizza is £5.99 collection or £8.99 delivery. The guy that I spoke to said it was for this week. (25th April). If you happen to drive past the London Road shop the poor staff are standing outside with signs for drivers to see. One poor person was in a padded batman suit.
The menu I was given has £6.99 collection and £9.99 delivered written inside as the prices. That offer expires on 3rd July and is not valid with any other offer. I think you need to call them to get the as I didn't see it on the website. I've linked so you can find your local store easily. This may be Leicester specific but there might be something similar in your area.
Don't think this includes stuffed bases etc.