You can get replacement rollers and the bottom guides at the Big Box stores.

I own an hvac business and most of my business is generated by several items which don't cost much.

There is a line item on your credit report called "High Balance".

For example in Salt Lake City, an old mall was replaced with City Creek Center, a walkable retail city block where a real grocery store is present.

If not, maybe you could salvage it for later use in bedrooms while you store it somewhere covered in flea powder and wrapped in plastic.

These blogs is written for the state of California if you don’t at least have a basic understanding of the real estate principals and real estate financing applicable to your state, I suggest you go to your public library, book store, amazon.com, whatever and get a copy of the real estate principals, financing and laws that apply to your state.

If items get torn up then we call them out and they get fixed or replaced.

Is a place like blinds to go the best route, do big box stores do custom blinds or should I try a local place?

If you've already accounted for foundation issues and other larger items, which it looks like you have with a 40k rehab budget, there's less of an unknown.

A GC is going to feel a lot worse about going $30K over budget (even if the change orders are new items that he didn't know about) than he will about going $10K over budget (especially when that $10K has been discussed).