You can buy LR + PS-CC as a subscription plan for US$10/month for a 1 year commitment and be able to use whatever versions of LR and PS are currently being sold.
You can also buy LR by itself, for US$150/once. The issue with that is that LR5 is nearing the end of its life and LR6 should be out shortly, so if you purchase LR5, now, and what LR6, you’ll be paying another US$80, so it might be worth waiting and buying LR6 when it is first available, or just signing up for the cloud and not worrying about which version comes out, when.
You’re apparently is another country outside the US so the prices are somewhat different but similar ratio, I’d expect.
The US$10/month (or your country’s equivalent) Photography Plan with both LR and PS is available, here:
The standalone LR is available, here:
Like ssprengel mentioned, expect to see Lightroom 6 released soon (rumors have it coming on March 9th, 2015). It's probably best to wait for the new version or look for a good deal on this outgoing version.
You can also buy a standalone copy of Photoshop CS6 (which is still sold at Adobe.com - see here). It the last version to be sold without having to signup for the subscription.