This is such a complicated topic, as there are so many different configurations of HW + flea/tick protection that are possible.
, there's no good HW protection that also offers excellent tick protection against multiple species of ticks. Revolution is as close as you'll get, with American Dog Tick protection built in...but that leaves out Lone Star Ticks carrying a lot of disease.
See this chart:
I think excellent tick protection probably requires two products, unfortunately -- unless covering Dog Ticks would be good enough for your area, in which case, Revolution would be the most cost-effective solution (but it's topical). It is among the more expensive HW prevention products, but if it's all you need, it would be a good deal (on sale right now at Valleyvet.com, it's 92/6 pack, or 15-and-change per month).
If you need to cover more species of ticks, to get the most cost-effective total protection, I think you might opt to do a stand-alone oral HW protection product --any version of "generic Heartguard" (like Tri-Heart Plus, etc.) if you live in an area where ivermectin still works well (i.e., not the Gulf Coast). One of the generic copycats of HG would be the lowest cost HW protection you can buy (valleyvet.com lists Triheart Plus as around $32 per 6 pack...5 bucks and change per month for heartworm-only protection, oral form).
I use NexGard during the summer when I travel to a tick-infested part of the country. It's an excellent, oral product for ticks and fleas. It's labeled for Lone Star tick, Black-legged (deer) tick, American Dog tick and Brown dog tick. It comes in 3-packs and 6-packs. It typically costs about $60/3 pack unless you catch a sale (Valleyvet.com has them on sale for $54/3 pack now...that's a good deal...$18/mo).
A slightly cheaper alternative to NexGard is Bravecto. It's labeled for the same 4 species of ticks. It's an oral chew that lasts for 3 months, making it incredibly convenient. It runs about $50/ea. (though there's a sale on Valleyvet.com on two-packs from time to time -- right now it's on sale 2 for $80....6 months of protection for $13 and change per mo.). I've used this in rescue for dogs that came to us having already had the ProHeart6 injection (6-month heartworm prevention product). They needed some flea protection in foster care, and Bravecto worked great for them.
The bottom line is that I think you could do what you want (oral prevention of HWs, fleas, and ticks) for under 25/mo using two products (and maybe even under $20/mo), if you're diligent about catching sales and price-shopping. (FWIW, the pricing I've used here is from Valleyvet.com because they're the lowest cost I've found for most RX meds for the rescue, and they're Vet-VIPPS certified, so you're get US FDA approved meds just like the vet sells, not gray market foreign stuff that may or may not be counterfeit. They have great customer service too. You'll need prescriptions from your vet of course.)
I've gone to vet appointments with spreadsheets comparing products (what they cover, how long, etc) in order to talk through optimal configurations. Sometimes the vet has some ideas that help too.