Hello @ChinmayPatil-4169 ,
Get-AzureRMVMSize -Location 'locationname'
Above cmlet returns all the possible SKUs available for the location disregarding limitations of your subscription. So, try and see the option suitable for your account and create the spot instance available at the location you selected.
If you need the details of the location name, you can check it using the following cmdlet
Get-AzureRmLocation |Format-Table
Please mark as "Accept the answer" if the above steps helps you. Others with similar issues can also follow the solution as per your suggestion
Regards,
Manu