Hi Ravi,
Just wanted to recommend you switch to MCUXpresso IDE. This tool is the follow on to LPCXpresso IDE, has no memory size restrictions and is where we are putting our development resources. This new IDE will be very familiar to LPCXpresso IDE, and has much better support for J-link, P&E probes, giving you other options.
LPC-Link2 is a very popular probe, so sometimes we get peaks of demand and run out of stock. However, this is usually a temporary issue. Our etailer partners, like Digikey, Mouser and Farnell/Newark usually carry a good amount of inventory. Embedded Artists also sell this probe directly from their webstore.
regards
Brendon