I think so too, every one is after a good deal and wood doesn't grow on trees

so is expensive, if you can source materials at a reasonable cost to yourself then there will only by your labour, travel is sooo expensive now and like you say, any local joiner that can get hold of a bit of wood from some where, may well undercut you!!!
I paid a lot for a poor quality hen house and would have gladly paid some one the same for a sturdy one, also dog kennels and runs. I bought a wonderful whelping box off E Bay, thats another thing thats easy to make but very expensive to buy!!
For pet products and putting up sheds etc, you can put your cards up in feed merchants, pet shops, supermarkets and garden centers!
THere is always hiring out your skills to local garden centers, at chritmas also you could sell some tubs for trees, just square ones!!!
We are both realy struggling, although we are busy with our B&B we need one of us in full time work to pay the bills and keep us afloat!!! FIngers crossed!!