Laura Mercier Primer has a cult following among MUAs and beauty afficionados. It is smoothing and perfecting, and the oil free version absorbs excess oil and reduces shine. It also blurs away fine lines and imperfections. I have used it for quite some time, and loved it.
I also love a high street/drug store bargain, and MUA is a brand that is great quality for very little money! I spotted their primer last summer and picked up a tube at Superdrug. I put it aside in a drawer, and rediscovered it a few weeks ago. I was very surprised to find it looked and smelled so much like my Laura Mercier Primer! Even better, it works just as well. And it is £4 compared to Laura Mercier's £28. BARGAIN. It doesn't contain the antioxidants that Laura Mercier does, but I don't think my skin misses it because I use really good skincare!
If you want to splurge you can purchase Laura Mercier Oil Free Primer here. If you want to save, you can try MUA Primer here.