Check what's available locally -- I have no idea where you're looking. If in the US, look for an Amazon seller with a long, good track record.  
Hi  I need a replacement battery for a Precision M4600 laptop, which I realise is an old laptop by now, however except for the battery it's quick and responsive. The battery I have right now is a 87 Wh R7PND. I have searched up and down for dell parts on dell.com but having problems finding it.  Anyone able to help?
New battery for Precision M4600