Low-cost 35mm develop-and-scan options do exist, but availability varies by country and by location.

From the community answers, examples include:

• In the UK: Photo Express, Metro Colour Lab, and Peak Imaging all offered develop-and-scan services with CD delivery at different scan resolutions.
• In the US: some Costco locations offered film developing plus scans to CD, though you would need to call specific stores to confirm service.
• Other common budget options mentioned were CVS/Eckerds, Target, and Walgreens.

The main thing to compare is not just price, but what is included: develop only vs. develop + prints, scan resolution, and whether scans are delivered on CD or another format. Quality can also vary between labs and between retail locations, so checking recent reviews or testing a roll first is a good idea before sending a large batch.

If you have over 100 rolls, a practical approach is to try one or two rolls with a local or mail-in lab, compare scan quality and turnaround time, then send the rest once you’re satisfied.