Hi guys, I'm looking to buy a SHS 5320 for my new place as some of you have done. Qoo10 seems like the most economical place to get one....however, I will need someone to install for me. Does anyone have any good and reliable contact for doing installation + patching up of existing door? I nterlock quoted me $240 to do it which I thought was quite high as I saw someone post before that they used to do it for $160.... I would be super thankful for any help! cheers....