Mariners fans should be somewhat familiar with these type of deals. 2 of the most notable types of these trades came fairly recently. First, when Jack Zduriencik traded Erasmo Ramirez in late March 2015 to the Rays for Mike Montgomery.
The other, and probably best example, came from March in 2016, when Mariners GM Jerry Dipoto traded cash to the Padres for Nick Vincent. These types of deals happen every year, and there are typically come under 2 circumstances.
First, an injury late in Spring Training forces a team to go out and find a suitable replacement for a short time.