If you just want general parts then just do a search on the internet for the cheapest parts. If you want HiLo specific parts then another source would be my HiLo dealer of 25yrs. Mantelli trailer sales 1-716-625-8877. Ask for Jay Simon in parts. He has an amazing supply of parts and experience. They will ship parts anywhere.
Do a Google search for RV day/night shades and you will find a number of sources. You would probably get a better price by not going through a dealer. They are not HiLo only.
The large blinds 62" x 24" over the kitchen sink counter are wrinkled and creased and will not "accordian" enough so they stick out below the valance. Not sure if they can be repaired under those circumstances but I'm open to suggestions!