IMHO it's relatively easy to "stealth camp" even if you have a white car etc. Try and park your car in deep shadow to prevent reflections from glass etc, have some sort of dense scrub to the road side and have the nose of your car (therefore the narrowest section) pointed to the most likely avenue of approach. You will be amazed at how your vehicle disappears.
Want to take it anothe step further? Get some cheap hessian. Pour a bit of diesel on it then rub it in the dirt around your camp (drag it behind your car for few hundred metres - that also eliminates your tyre tracks....) Leave for a day or two to let it dry and the smell to evaporate. Drape that over your car and even you will have trouble finding it. Lol. You can use it again and again in same area.
Change sites? Cut and paste until the hessian wears out.
Cam nets are awesome but bloody expensive.
Remember 6 Ss and an M! Shape, shadow, silhouette, shine, spacing, movement and the sixth S, sound.
Keep a low profile, keep it pretty quiet, no roaring campfires and your movements smooth and slow and you could camp in a city park and no-one would know you are there....lol
My wife suggested Spotlight. Otherwise I can't suggest anywhere. Maybe a less well known hardware store, Seen it by the roll but I can't, for the life of me, think where.