For a Prodigy Comp 5" with an astigmatism and a budget under $400, your best options are a Holosun pistol optic with multiple reticle options or a larger-dot Vortex Defender-ST. The key is to find an optic with features that minimize the "starburst" effect caused by your astigmatism, such as a large or multi-reticle system and clear glass.
Holosun optics (MRS models)
Holosun is widely recommended for shooters with astigmatism because its Multi-Reticle System (MRS) can help find a reticle that appears clearer to your specific vision.
Holosun HS507C X2
Best for: Finding the clearest reticle for your eyes.
Why it works: The MRS allows you to switch between a 2 MOA dot, a 32 MOA circle, or the combination of both. Many shooters with astigmatism find that the larger circle or the full circle-dot appears clearer than a single dot.
Other features: It uses the standard Trijicon RMR footprint, which is compatible with the Prodigy's Agency Optic System (AOS) plates. It also has a solar failsafe and shake-awake technology.

Try vortex optics

I'd recommend Vortex optics for astigmatism as well as the fact that they carry a lifetime warranty. Very good quality and a reputable company. Happy shooting!

Sir Richard,
For astigmatism, a smaller dot (like 2 MOA) tends to produce less starburst or ghosting.
Here are some red dot sight options suitable for the Prodigy Comp 5" that are good for someone with astigmatism and priced under $400:
Vortex Crossfire Red Dot (2 MOA or 6 MOA)
Features: Compact, reliable, crystal-clear red dot, adjustable brightness.
Price: Around $150-$200
Pros: Good for astigmatism; large eye box; durable.
Holosun HS503CU (2 MOA Dot with Solar Panel)
Features: Multiple reticle options, shake-awake technology, solar backup.
Price: Around $250-$300
Pros: Reduces ghosting, good clarity for astigmatism, long battery life.
Sig Sauer RomeoZero Reflex Sight
Features: 3 MOA dot, lightweight, compact.
Price: About $150-$200
Pros: Clear dot, good for astigmatism, durable.
Hope this helps Sir Richard, and hopefully you'll catch some good Labor Day sales. 😀

Good afternoon to you!! Please see below link for more information. Hope this helps. Have a good rest of your day.
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Hi Richard and welcome. I have astigmatism and have the Holosun 507c and the Cyelee WOLF2 for Astigmatism. The Cyelee is much sharper and is as durable as the Holosun at a great price. Many youtube reviews as well. amazon.com/Cyelee-Astigmatism-Circle-Footprint-Reticle/dp/B0CBHQD8CS?th=1 ---------------- youtube.com/results?search_query=cyelee+wolf+2+for+astigmatism ----------- Cheers, stay safe and enjoy!