If you are looking for Merkur Model 180 blades, then you’re in luck. These blades are pretty easy to find. The Merkur 180 takes the standard safety razor/DE blades. Most likely you can take a stroll down to your local drug store or Wal-Mart and find them for sale.
The only brand I’ve found at the local drugstores and Wal-Mart is Wilkinson. Some people will argue that Wilkinson is not good quality, but when you are paying $1.73 for a pack of five that’s a hard price to beat for the convenience. I can easily get 3-5 shaves out of these blades. I could probably get more shaves out of them, but I haven’t really cared to try.
If you want to get an even better deal you can shop online. I’ve bought a pack of 100-count Astra blade safety razor blades for $11.99 on Amazon. If you just buy them by themselves, the cost of shipping is going to eat into your savings, so I recommend that you buy them with other online purchases if possible.
There are a variety of brands to choose from. I haven’t tried them all, but out of all the ones I have tried I have been able to get multiple shaves out of them. When it comes to choosing a particular brand I recommend just trying out different blades and see which ones you like best. Buy one brand to begin with. Then when you run out of blades try a different plan. Keep doing this until you find a brand you like.