Best insoles for plantar fasciitis?

Hey im currently suffering form plantar fasciitis? Has anyone got any advice on how to get rid of it and carry on cycling? I have heard custom insoles are good for it but I really don't have the budget for them. I have equally heard that custom insoles are just the same as off the shelf ones.. don't know what the truth is. Any ideas? Thank you!
Been looking at these these off the shelf insoles which seem to have lots of arch support but dont know what to pick though
https://nuovahealth.co.uk/product-category/insoles-for-flat-feet/
Been looking at these these off the shelf insoles which seem to have lots of arch support but dont know what to pick though
https://nuovahealth.co.uk/product-category/insoles-for-flat-feet/
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http://www.healthandcare.co.uk/insoles- ... -pair.html
EDIT : you can get them cheaper on Amazon but I had trouble getting the link to work.