As mentioned above, this deal won't necessarily work for everyone, as you'll need to own an Alexa device that is linked to your account. If you meet that criteria, then you're in luck.
Right now, you can grab TP-Link's Wi-Fi smart plug mini or LIFX's mini white smart bulb for just $10 at Amazon when you use coupon code SMART10 during checkout. This is almost at the impulse buy threshold. Coming in at $10 each, this could allow one to better be able to afford to give both a try and institute some smart home capability within your home.
Or at least expand the lineup of your current set up.
Amazon is also promoting several other smart home accessories at a discount, so make sure to catch those as well with code SMART20.