Is it common probably not, however it would really be hard to tell since animals can be asymptomatic for years and anyone experiencing IBD in their collection is not likely to make this public or talk about it.
DR Jacobson of the university of Florida has work extensively on IBD and there is now a reliable blood test, as for anything the total cost will vary (vet visit, drawing blood, sending the blood out, the test itself) so you will have to ask your vet.