Which SMS gateway is good for bulk SMS at the best price? 

There are several bulk SMS gateways available, such as Twilio, Textlocal, MSG91, and others. Your choice really depends on your location and specific needs—some excel at API integration, while others shine with interface and campaign tools, and some are more affordable.

If you're looking for a budget-friendly option that doesn't compromise on reliability, I recommend checking out www.digintra.com. While not as well-known as the larger brands, but prices are competitive, especially for startups and small businesses, and they offer fast support, as well as features like templates and DLT integration for India. It's worth considering if you're budget-conscious but still need reliable delivery. 

However, be sure to compare 2–3 providers based on your volume and location before making a decision.