Pretty sure it is but for $5 it looks like you did pretty good, looks like another real milk is there, and one of those jars could easily be worth more than you $5.
i believe there is a big business in reproducing those bottles in all sorts of colors. i've seen them at flea markets around here in clear, amber, green, blue and milk glass. some folks sell for them decorations but a few try and pass them off as real.