After several rounds of negotiations with Bournemouth, a fixed fee of £20million was agreed which could, depending on appearances for Villa and England, rocket to £26.5million.
Mings told BirminghamLive: "Yes, I was [surprised]. I knew Bournemouth wanted the money back for players they had signed so I thought the figure would have been about £15m or £16m. Everyone would have looked at that and said, 'That's probably a good deal'. Then it went up to whatever it went up to in the end and people were looking at it thinking, 'I don't know whether we have had our pants pulled down here!'
"I don't think there was anyone at Villa, with the impact I had last year, that thought it was a rip-off. It might have been higher than they wanted to pay but I think the most important thing was keeping the majority of the group we had together from last year.
"It was probably more than Villa wanted to pay but it is supply and demand. There is only one of me and I felt like I could come back here and make a positive impact and the manager thought that as well. But then you do look at some of the prices centre-backs went for and those that were quoted. I think it was about right!"