Allow me to share a solution to the lack of laundry facilities that can properly starch collars, cuffs, etc.
The are still some places where you can find powdered clothing starch, but there is so little demand that it is becoming more difficult every day. So, I followed the simple instructions in the link above to create boiled starch with regular food-grade cornstarch. It is cheap and easy to find.
Instead of using the microwave as recommended above, I used my stove and a wire whisk as I found it easier to keep the mixture smooth.
If done correctly, it should only take 10-15 minutes to create the starch, another 10 minutes or so to cool it, and a few more minutes to starch the items. I only starched three collars, and two vintage lace table covers that look better with boiled starch. It took me 10 minutes to soak everything and hang it up to dry.
Each collar then had to be ironed (highest heat setting) using a bit of water to wet the fabric. I did not use steam.
Total time, including making the starch, required: 40 minutes.
Cost: one box of cornstarch, which I had in the cupboard
Considering traffic, cost of petrol, etc. this was a much easier and cheaper way to do it, and just as effective.