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Replace or repair internal doors

I have three slightly damaged wooden veneer, varnished doors which need replacing or repairing, whichever is the most cost effective. Two have holes (where an elbow has gone through for example) which I don't think can be repaired because of the varnish finish, the other is covered with stickers which could probably be stripped and re-varnished. I'm just looking for the cheapest option to tidy these doors up without changing to a painted finish and suspect replacing the doors will be the way to go but would appreciate any advice.