diff --git a/feely_pona.cpp b/feely_pona.cpp
index 39c7dfc..01f81e5 100644
--- a/feely_pona.cpp
+++ b/feely_pona.cpp
@@ -2218,8 +2218,19 @@ void FP_Render(FP_Game *game, TELY_Platform *platform, TELY_Renderer *renderer)
             {
                 FP_GameRenderSprite *sprite = &game->player_merchant_menu;
                 if (!sprite->asset.anim || sprite->asset.anim->label != mapping.menu_anim) {
-                    sprite->asset               = TELY_Asset_MakeAnimatedSprite(&game->atlas_sprite_sheet, mapping.menu_anim, TELY_AssetFlip_No);
-                    sprite->started_at_clock_ms = game->clock_ms;
+                    sprite->asset                           = TELY_Asset_MakeAnimatedSprite(&game->atlas_sprite_sheet, mapping.menu_anim, TELY_AssetFlip_No);
+                    sprite->started_at_clock_ms             = game->clock_ms;
+                }
+
+                bool trigger_buy_anim    = false;
+                uint64_t buy_duration_ms = 500;
+                if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_J)) {
+                    game->player_trigger_purchase_timestamp = game->clock_ms + buy_duration_ms;
+                } else if (TELY_Platform_InputScanCodeIsDown(input, TELY_PlatformInputScanCode_J)) {
+                    trigger_buy_anim = true;
+                    if (game->clock_ms > game->player_trigger_purchase_timestamp) {
+                        // TODO(doyle): Do buy logic
+                    }
                 }
 
                 uint64_t  elapsed_ms     = game->clock_ms - sprite->started_at_clock_ms;
@@ -2241,6 +2252,19 @@ void FP_Render(FP_Game *game, TELY_Platform *platform, TELY_Renderer *renderer)
                                             Dqn_V2_Zero /*rotate origin*/,
                                             0.f /*rotation*/,
                                             TELY_COLOUR_WHITE_V4);
+
+                if (trigger_buy_anim) {
+                    uint64_t start_buy_time = game->player_trigger_purchase_timestamp - buy_duration_ms;
+                    uint64_t elapsed_time   = game->clock_ms - start_buy_time;
+
+                    Dqn_f32 buy_t          = DQN_MIN(elapsed_time / DQN_CAST(Dqn_f32)buy_duration_ms, 1.f);
+                    Dqn_Rect buy_lerp_rect = {};
+                    buy_lerp_rect.pos      = Dqn_Rect_InterpolatedPoint(merchant_menu_rect, Dqn_V2_InitNx2(0.68f, 0.215f));
+                    buy_lerp_rect.size.w   = (merchant_menu_rect.size.w * 0.211f) * buy_t;
+                    buy_lerp_rect.size.h   = merchant_menu_rect.size.h * .611f;
+
+                    TELY_Render_RectColourV4(renderer, buy_lerp_rect, TELY_RenderShapeMode_Fill, TELY_Colour_V4Alpha(TELY_COLOUR_RED_TOMATO_V4, 0.5f));
+                }
             }
 
             // NOTE: Render the merchant button
diff --git a/feely_pona_game.h b/feely_pona_game.h
index 55d0c0c..c4a2632 100644
--- a/feely_pona_game.h
+++ b/feely_pona_game.h
@@ -260,6 +260,7 @@ struct FP_Game
 
     FP_GameEntityHandle                   player;
     FP_GameRenderSprite                   player_merchant_menu;
+    uint64_t                              player_trigger_purchase_timestamp;
 
     FP_GameEntityHandle                   merchant_terry;
     FP_GameEntityHandle                   merchant_graveyard;