@Pahwa, Himanshu Azure for students subscription offers only 100$ credit for the first 12 months with select free services without providing any payment options. You may have to upgrade to a Pay-As-You-Go subscription by contacting Azure Support if the above service is not available for your subscription.
Alternately, you might also want to check if any other size is available when you click See all sizes by selecting a different region as in some cases the sizes available changes with region selected.
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