Plant pot "feet"

I have about 30 pots planted up at the moment and several of them seem to be struggling due to waterlogging, I'm thinking that if I raise them off the ground then that will aid drainage and aeration. What are people using to do this ?
I don't want to spend £100 on proper pot feet so I'm looking for alternative ideas.
Thank you.
I don't want to spend £100 on proper pot feet so I'm looking for alternative ideas.
Thank you.
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https://www.homebase.co.uk/pot-feet-in-terracotta-pack-of-3-_p228591
Also got 12” slot together decking for some, I also bought some very cheap little plastic feet can’t remember from where though, try google.
As Hostafan and Pansy says, strips of wood will do the trick for cheapy.