If you're looking for just the drivetrain, IRO has some good options, they have package deals on their website for $120 or so.
Otherwise if you're looking to buy the parts individually -
Crankset - $80 + up
Chainring - $20 + up
Singlespeed chainring bolts - $10
Singlespeed chain - $10 + up
Singlespeed Cog - $25 + up
A singlespeed wheelset is gonna set you back the most, the hubs vary, if you're getting a flip- flop hub with fixed and singlespeed it might cost you more than one with just a fixed, or just a freewheel.
But yeh, maybe around $100.
This is considering you buy all new parts too, you might want to check on your local Craigslist, or go down your local bike shop, and see if they have any rummage bins for used parts. You can usually find stuff for a lot cheaper that way!
Riding a single speed bicycle can improve your fitness, simplify maintenance, and provide a more connected and engaging riding experience.
The recommended single speed chain size for optimal performance and compatibility with your bicycle is typically 1/8 inch.
Single speed cranks in a bicycle offer advantages such as simplicity, lighter weight, easier maintenance, and a more direct power transfer to the wheels.
The purpose of a single speed freewheel sprocket in a bicycle drivetrain system is to allow the rider to coast without pedaling while the bike is in motion.
A single speed bottom bracket in a bicycle can provide advantages such as simplicity, lower maintenance requirements, lighter weight, and improved power transfer efficiency.
Using a single speed road crank on a bicycle can provide advantages such as simplicity, lighter weight, easier maintenance, and a more efficient power transfer.
The advantages of using a square taper crankset for a single-speed bicycle include simplicity, cost-effectiveness, and ease of maintenance. The square taper design is durable and reliable, making it a popular choice for single-speed setups.
A bicycle chain tensioner in a single-speed bike helps maintain the proper tension in the chain, preventing it from slipping or coming off the gears during riding.
The output from the dynamo varies with the speed of the bicycle. And as a geared bicycle is likely(but don't have to) travel a bit faster than the single speed, it may produce a bit more electricity.
Using a single speed crank set in a bicycle can provide advantages such as simplicity, lower maintenance, lighter weight, and improved efficiency due to fewer moving parts.
Using a single speed crankset in a bicycle can make the bike lighter, simpler, and easier to maintain. It can also provide a more direct power transfer and a smoother riding experience.
Riding a single speed freewheel bicycle can be advantageous because it is simpler, lighter, and requires less maintenance compared to a multi-speed bike. Additionally, single speed bikes can provide a more direct and efficient riding experience, making them ideal for urban commuting or casual cycling.