Budget Front Ported Bookshelf Recommendations

Thanks in advance. Looking for a budget pair of front ported bookshelf speakers. Would prefer 8 ohms, 88+ dB, not greater than 12" x 8" fronts. Will be placed into stone "cubby holes' either side of my fireplace, not subjected to heat. These will serve to augment TV sound and background music in our living room. Will be driven by an inexpensive 18 WPC SS amp andl be mated to subwoofer, however run full range. Budget is $300 retail. Not many budget speakers are front ported.

Have found Polk Audio M10 to fit the above, however have nor heard them. I will continue online search.