2IIM is a damn neat option. I run 2IIM so that is pretty much what you can expect me to say, so let me elaborate on this a little bit.
Budget comes in two parts - Money and Time. Very often, when we evaluate services, we tend to take into account the measurable price, and not so much the immeasurable (and immeasurably important) value of time. Let me give an example .
Let us say you need to get a nice hair cut done. Stylist A does a damn neat job and for Rs. 200. Stylist B does an equally good job but charges Rs. 250. The average wait time at A is 45 minutes, whereas at B it is only 5 minutes. Which would you choose?
If you value your time even slightly, it has got to be B. Rs. 50 is not adequate compensation for 40 minutes of your time.
The internet is this vast, beautiful value-filled place. Youtube alone gives learning avenues worth millions of $. I recently saw a proof of why Pi is irrational by Mathologer that was brilliant. But there are three issues with learning purely from Youtube
1) Search cost is high. Sometimes prohibitively so. Youtube is a fun place to navigate, learn something new, get lost, get entertained and return to reality. But if you have to learn something specific, you might end up spending too much time just searching for videos.
2) Tracking is tough: Knowing the right level of difficulty for your exam (the beloved CAT), going beyond the simple ones and stopping short of the crazy-tough ones is difficult in an un-curated platform
3) Feedback mechanism is non-existent: You do not get to know where you stand, how well you compare with the peer-group, how many questions you have completed and how quickly, etc. when you learn on Youtube.
So, pick a platform where the pedagogy is good, the course is well-structured and the UI is intuitive. At 2IIM, we have created the entire course to teach well, benchmark well, and have fun doing it. If you look at the whole package, it is the least expensive course out there by a distance. :-) You can check out up to 20 hours worth content without paying a dime.