The ornamental design for a shampoospachair, as shown and described.
FIG. 1 is a top plan view of a shampoo spa chair showing my new design, with the chairback shown in a reclined position at a 45° angle;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a front elevational view of my shampoo spa chair as shown in FIG. 1 with the chairback raised in an upright position;
FIG. 4 is a rear elevational view of my shampoo spa chair as shown in FIG. 3, with the handle shown in a lowered position; and,
FIG. 5 is a side elevational view of my shampoo spa chair as shown in FIG. 3.
The shower head and shampoo bottles shown in dashed lines are included for the purpose of illustrating environment and form no part of the claimed design.